The following list of free and paid tools will help you in SEO and Content marketing to provide advance and better service to your customers.
Google’s Keyword Tool
You’ll need a Google AdWords account for access Google’s Keyword Tool, but with it, you can perform many of the same research tasks the Keyword Tool provided for revealing related phrases, popularity counts, and competitive search rankings.
WordStream
WordStream is powered for PPC keyword research. It offer some free tools that allow you to research keywords, find niche keywords, group related keywords together, and find negative keywords that would be used as filters for a PPC campaign.
Wordtracker
Wordtracker’s keyword research is one of the old running keyword search tools in the market. It will provide 10 alternative suggestions for your selected keyword, as well as search volume estimations for popularity, competition, and KEI score (a ratio of search volume vs. competition).
Ubersuggest
This tool is completely free and works by collecting auto-suggestions from Google searches. It collects information for text searches on Google.com, as well as searches for images, news, shopping, video, and recipes.
SEMrush
If you ever wanted to know what keywords your competitors (or any site) had visibility for on Google, this tool helps you.
InboundWriter
For content creators just getting their feet wet with SEO copywriting, tools like InboundWriter can provide guidance on keyword research as it is applied to a specific document.
Google Webmaster Tools
Google’s webmaster tools, provide a reports range from crawling errors to determinations of the keywords that appear most often in Google’s search results. I
Screaming Frog SEO Spider Tool
Screaming Frog is a software program you run locally that crawls websites and reports back with a wide range of data, including all the files on your site; individual web pages (and all the elements of a web page); internal and external links; response codes; page speeds; and many others.
KnowEm SMO
This is a handy tool for checking the code on any web page to see if it includes code for Facebook’s Open Graph protocol, Google+ Authorship, LinkedIn, and Twitter’s Summary Card data. It also checks for some really basic SEO elements.
Majestic
Majestic enables marketers to research links to their content and provides a very robust service for free, including overview information about link types, sources, and history, as well as a list of pages and text most often used in those links.